AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 209

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

25.9.10
Register Name:
Access Type:
• CSS: Master Clock Selection
• PRES: Processor Clock Prescaler
31
23
15
–
–
–
7
–
PMC Master Clock Register
0
0
0
0
1
1
1
1
0
0
1
1
30
22
14
PMC_MCKR
Read-write
–
–
–
6
–
29
21
13
–
–
–
–
5
CSS
PRES
0
0
1
1
0
0
1
1
28
20
12
–
–
–
4
0
1
0
1
PRES
27
19
11
–
–
–
3
0
1
0
1
0
1
0
1
Clock Source Selection
Slow Clock is selected
Main Clock is selected
Reserved
PLL Clock is selected.
26
18
10
–
–
–
2
SAM7S Series [DATASHEET]
Processor Clock
Selected clock
Selected clock divided by 2
Selected clock divided by 4
Selected clock divided by 8
Selected clock divided by 16
Selected clock divided by 32
Selected clock divided by 64
Reserved
6175M–ATARM–26-Oct-12
25
17
–
–
9
–
1
CSS
24
16
–
–
–
8
0
209